package com.license.core;

import de.schlichtherle.license.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;

import java.io.File;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.text.SimpleDateFormat;
import java.util.prefs.Preferences;

/**
 * 在项目启动时安装证书
 *
 * @author sunHeng
 * @since 1.0.0
 */
@Component
public class LicenseCheckListener implements ApplicationListener<ContextRefreshedEvent> {
    private static Logger logger = LogManager.getLogger(LicenseCheckListener.class);

    /**
     * 证书subject
     */
    @Value("${license.subject}")
    private String subject;

    /**
     * 公钥别称
     */
    @Value("${license.publicAlias}")
    private String publicAlias;

    /**
     * 访问公钥库的密码
     */
    @Value("${license.storePass}")
    private String storePass;

    /**
     * 证书生成路径
     */
    @Value("${license.licensePath}")
    private String licensePath;

    /**
     * 密钥库存储路径
     */
    @Value("${license.publicKeysStorePath}")
    private String publicKeysStorePath;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        //root application context 没有parent
        ApplicationContext context = event.getApplicationContext().getParent();
        if (context == null) {
            if (StringUtils.isNotBlank(licensePath)) {
                logger.info("++++++++ 开始安装证书 ++++++++");
                install();
                logger.info("++++++++ 证书安装结束 ++++++++");
            }
        }
    }
    public synchronized LicenseContent install(){
        LicenseContent result = null;
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        //1. 安装证书
        try{
            LicenseManager licenseManager = LicenseManagerHolder.getInstance(initLicenseParam());
            licenseManager.uninstall();

            result = licenseManager.install(new File(licensePath));
            logger.info(MessageFormat.format("证书安装成功，证书有效期：{0} - {1}",format.format(result.getNotBefore()),format.format(result.getNotAfter())));
        }catch (Exception e){
            logger.error("证书安装失败！",e);
        }

        return result;
    }
    private LicenseParam initLicenseParam(){
        Preferences preferences = Preferences.userNodeForPackage(LicenseVerify.class);

        CipherParam cipherParam = new DefaultCipherParam(storePass);

        KeyStoreParam publicStoreParam = new CustomKeyStoreParam(LicenseVerify.class
                ,publicKeysStorePath
                ,publicAlias
                ,storePass
                ,null);

        return new DefaultLicenseParam(subject
                ,preferences
                ,publicStoreParam
                ,cipherParam);
    }
}
